Carbureter



C. W. HESS.

CARBURETER.

APPLICATION HLED JAN. 2, 1918.

Patented $6913 28, 192% -manifold connection 5.

PATENT OFFICE.

CLARE W. HESS, OF FLINT, MICHIGAN.

CARBURETER.

Application filed January 2, 1918.

To all it hom it may concern.

Be it known that I, CLARE \V. Hess, a. citizen of the United States of America, residing at Flint, in the county of Genesee and State of Michigan, have invented certain new and useful Improvements in Carbureters, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to carbureters, and my invention aims to provide an extremely simple, durable and inexpensive carbureting device for various kinds of fuel, and it is in this connection that the carbureter may be associated with a float chamber or have communication with a suitable supply of fuel.

My carburetor includes a novel automatic or self-adjusting metering pin and valvular member, said pin and member being articulated for movement in synchronism. with the pin automatically regulating the supply of fuel to the carbureter and the valvular member controlling, to a certain degree the admission of air thereto, said pin and member being disposed so that the air and fuel may intimately commingle to secure a thoroughly mixed explosive mixture for an internal combustion engine.

My invention will be hereinafter specifically described, and reference will now be had to the drawing, wherein Figure 1 is'a vertical sectional a carbureter;

view of Fig. 2 is a horizontal sectional -view taken 'c-n the line Il-H of Fig. 1, and

Fig. 3 is a horizontal sectional view taken on the line III-III of Fig. 1.

In the drawings, the reference numeral 1 denotes a cylindrical carbureter body that has the lower end thereof closed by a wall 2,

and contiguous to this wall is a side air inlet connection 3.

The upper end of the body 1 is interiorly screwthreaded as at 4, to receive a connection 5 so that the carbureter body may be attached to a suitable manifold, (not shown). The manifold connection 5 supports the usual throttle valve 6 that may be adjusted in the usual manner, for instance through the medium of a crank 7 at the side of the By leaving the throttle valve (3 in the manifold connection 5, the carbureter body 1 may be easily and quickly remc-ved from the manifold connection without disturbing the throttle 6.

Specification of Letters Patent.

.space between the lower Patented Sept. 28, 1920.

Serial No. 209,992.

Centrally of the bottom wall 2 and extending upwardly [into the body 1 is a conical shaped nozzle or member 8 having a cylindrical bore 5) open at its upper end and its lower end extending into the wall 2. The lower end of the bore 9 isin communi cation with a small port 10 opening into a valve chamber 11 and in the valve chamber 11 is a needle valve 12, carried bya screw 13 adjustable in the outer endof the chamber and at the side of the wall 2. By adjusting the screw 13, the needle valve 11 may be moved to and from the port 10 and set so that a predetermined quantity of fuel may pass through the port 10 into the lower end of the bore 9.

The wall 2 has a depending exteriorly screwthreaded boss 14 provided with an opening 15 in communication with the valve chamber 11, and a cap 16 on the boss 14: holds the end of a supply pipe 17 against the boss so that fuel may be delivered to the valve chamber. 'The supply pipe 17 may directly connect with a suitable supply of fuel as gasolene or kerosene, or as intimated in the beginning, the valve chamber 11 may communicate with an ordinary float chamber (not shown). Slidable in the carbureter body 1 and movable to and from the conical nozzle 8 is a valvular. member 18. The valvular member 18 has both ends thereof open and the inner wall 19 of said valvular member tapers from the upper end of said member to the lower end thereof, and is the reverse of the taper of the nozzle 8, as said nozzle has its walls tapering inwardly from the lower end thercofto the upper end. It is therefore evident that the end of the valvular member 18 and the conical nozzle 8 may be varied when the valvular member 18 is raised and lowered, and to limit the downward movement of the valvular member and hold said member in a prescribed lower position relatively to the nozzle 8, a set screw 20 is adjustable-in the wall 2 and engages the lower end of the valvular member 18.

The upper endof the valvular member 18 has a spider or transverse member 21 and loosely supported centrally of said spider by heads 22 is a cylindrical metering pin 23 that extends into the bore t). The upperself centering in the bore 9. The diameter of the metering pin is slightly less than that of the bore 5) so'as to provide a very small. annular space between the walls of the bore 9 and the walls of the metering pin, this space being exaggerated in Fig. l of the drawing. It is such that fuel may be drawn upwardly between the walls of the.

bore 9 and the pin 23, preferably in the form of a film, and in some instances the fuel will overflow from the upper end of the conical nozzle around the inclined walls thereof, also in the form of a film, so that air may readily attack the same.

On low speed or when an engine is idling, the valvular member 18 is in the position shown in Fig. 1, and it will be noted that the lower edges of the wall 19 are in proximity to the inclined walls of the conical nozzle, thus providing a small annular space through which air may be drawn into the valvular member 18 and upwardly into the carbureter body. The suction or reduction of atmospheric pressure withinthe carbureter body 1 is not sufiicient to carry liquid fuel out of the nozzle and up into the carbureter body 1, but is sufficient to cause a small quantity of fuel to-overflow the upper end of the nozzle 8 and downwardly on the inclined walls thereof, where the film of fuel will be attacked by the air entering the lower end of the valvular memberand the fuel will be vaporized and carried into the upper-portion of the carbureter body which serves as a mixing chamber. By reason of the metering pin being in a lowered position, it is obvious that the fuel has a narrow and longer passage between the nozzle and the pin, to travel through, than if the pin were elevated, and it is the friction of the fuel against the walls of the bore 9 and the pin 23 that tends to reduce the flow of the same.

Now, when the throttle 6 is open wide to permit of greater speed on the part of an engine, the valvular member 18 is raised accordingto the suction or reduction of atmospheric pressure in the carbureter body. As the 'valvular member 18 is raised and the space between the lower end of said member and the conical nozzle 8 is increased, allowing a greater flow of air into the valvular member and the carbureter body, and it is this flow of air that immediately picks up fuel as it is emitted at the upper end of the nozzle. The flow of fuel from the nozzle is also increased by reason of the metering pin 23 being raised, thus offering less resistance to the fuel as it is drawn from the nozzle.

One embodiment of my invention has been illustrated, but it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claim.

What I claim is A carbureter comprising a cylindrical body having a side air inlet connection, a conical shaped nozzle integral with the bottom of said body and provided with a cylindrical bore extending into the bottom of said body, a fuel inlet communicating with said nozzle, an air valve free to slide in said body to and from said conical nozzle and having an inner wall tapered the reverse of the wall of said nozzle and the small end in proximity to the bottom of said cylindrical body and capable of seating thereon, a cylindrical metering pin loosely connected to said valve and extending into the bore of said nozzle, and a screw carried by the lower end of said body engaging the lower end of said valvular member and adapted, to

limit the downward movement of said val- CLARE WV. HESS.

W'itnesses KARL H. BUTLER, ANNA M. DORR. 

